Two floors of a three-story apartment building have collapsed in Paris following an alleged gas explosion. At least five people have been injured, two are in a serious condition.

The explosion happened on Friday afternoon shortly after 2:30PM local time in the western Parisian suburb of Boulogne-Billancourt.

Firefighters were deployed to the scene but two floors of the building were completely destroyed in the blast which authorities believe was caused by a gas leak, local media reported citing police sources.